Radioactive iodine volatilization inhibition effect of cyclodextrin

Hirota, Mitsutomo; Higaki, Shogo; Ito, Shigeki; Ishida, Yoshiyuki; Terao, Keiji

doi:10.1007/s10967-019-06504-x

Cited by 8 publications

(7 citation statements)

References 6 publications

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“…In 2019, Hirota et al. found that cyclodextrins can inhibit the volatilization of radioactive iodine and maintain consistent 131 I retention even at high doses up to 30,000 Gy [94] . In 2021, Gong et al.…”

Section: Molecular Clustersmentioning

confidence: 99%

“…In 2019, Hirota et al found that cyclodextrins can inhibit the volatilization of radioactive iodine and maintain consistent 131 I retention even at high doses up to 30,000 Gy. [94] In 2021, Gong et al report a three-component self-assembly system involving macrocycles (all-hydrocarbon octaaryl macrocycle cyclo [8](1,3-(4,6-dimethyl)benzene (D 4d -CDMB-8), corannulene (Cora) and I 2 ). [79] When three components were mixed in cyclohexane, supramolecular iodine-containing capsules (D 4d -CDMB-8) 3 �(Cora) 2 )�I 2 were obtained (Figure 10b).…”

Section: Metal-organic Cagesmentioning

confidence: 99%

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Cluster‐Based Crystalline Materials for Iodine Capture

Wang

Liu

Zhang

et al. 2022

Chemistry A European J

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The treatment of radioactive iodine in nuclear waste has always been a critical issue of social concern. The rational design of targeted and efficient capture materials is of great significance to the sustainable development of the ecological environment. In recent decades, crystalline materials have served as a molecular platform to study the binding process and capture mechanism of iodine molecules, enabling people to understand the interaction between radioactive iodine guests and pores intuitively. Cluster‐based crystalline materials, including molecular clusters and cluster‐based metal‐organic frameworks, are emerging candidates for iodine capture due to their aggregative binding sites, precise structural information, tunable pores/packing patterns, and abundant modifications. Herein, recent progress of different types of cluster materials and cluster‐dominated metal‐organic porous materials for iodine capture is reviewed. Research prospects, design strategies to improve the affinity for iodine and possible capture mechanisms are discussed.

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Section: Molecular Clustersmentioning

confidence: 99%

Section: Metal-organic Cagesmentioning

confidence: 99%

Cluster‐Based Crystalline Materials for Iodine Capture

Wang

Liu

Zhang

et al. 2022

Chemistry A European J

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“…CD structure consists of a hydrophilic exterior and a hydrophobic inner cavity [17,18]. Such unique cavity allows CD to contain pollutants via the formation of "host-guest" encapsulated-inclusion complexes with those pollutants [18][19][20]. Cyclodextrins are basically 3 types α-, βand γ-cyclodextrins having six, seven, or eight glucose units, linked with α-1,4-glycosidic bonds, respectively [18].…”

Section: Introductionmentioning

confidence: 99%

“…Cyclodextrins are basically 3 types α-, βand γ-cyclodextrins having six, seven, or eight glucose units, linked with α-1,4-glycosidic bonds, respectively [18]. Cyclodextrins form inclusion complexes with iodine [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Al-Fulaiti¹,

El-Shafey²,

Kindi³

et al. 2022

Pol. J. Environ. Stud.

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The presence of excessive amount of iodine, especially radioactive iodine is dangerous in the environment. The aim of this research is to prepare functionalized silica with cyclodextrin with different hydrophobic cavity sizes to investigate their performance in iodine adsorption. Cyclodextrin (CD) derivatives (αCD, βCD, γCD and hp-βCD) were successfully immobilized on silica gel surface via epichlorohydrin as a cross linker. The ratio of silica (Si) to CD was optimized in preliminary experiments based on the highest uptake of iodine. Selected adsorbents with varied ratios of silica to CD derivatives are investigated, including Si-αCD (3:2), Si-βCD (4:1), Si-γCD (4:1) and Si-hp-βCD (4:1). The adsorption of iodine (I 2 /KI) solution was investigated in terms of initial pH, contact time, iodine concentration and temperature. No significant variations was noticed for iodine adsorption at different pH values, thus, initial pH 6 was selected for further studies. Equilibrium adsorption was reached faster on Si-hp-bCD than other adsorbents with kinetic adsorption data fitting well pseudo second order model. Activation energy (E a ) was found to be in the range of 12.7-23.4 kJ/mol. Equilibrium adsorption data were found to fit well the Langmuir adsorption model with lower uptake as temperature rises. Iodine uptake follows the order: Si-hp-βCD (714 mg/g) >Si-αCD (625 mg/g) >Si-βCD (555.6 mg/g)> Si-γCD (435 mg/g). Thermodynamic study showed that iodine adsorption is exothermic and spontaneous. Adsorbents' reuse exhibited excellent performance for iodine adsorption with a decrease in iodine uptake of ~2-4% in the third adsorption cycle. The study shows that the functionalized silica with hp-bCD shows best performance in terms of kinetics and equilibrium.

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“…1 Radioactive iodine can also enter the human body through water, food, etc, and cause serious harm to environment and human health. 2,3 Thus, the research on iodine adsorption has attracted broad interests. The earliest iodine adsorbents were mainly inorganic adsorption materials, activated carbon, 4 zeolite 5 etc.…”

mentioning

confidence: 99%

Synthesis of One Covalent Organic Framework (COF) Based on C=N Bonds and Its Excellent Performance of Iodine Adsorption

Duan¹,

Yingbin²,

Li³

et al. 2021

HETEROCYCLES

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Radioactive iodine is one of the main substances existed in nuclear wastes. It can quickly diffuse into the atmosphere causing great harm to environment and human health. Therefore, how to capture radioactive iodine efficiently has become a research hotspot. Herein, a covalent organic framework (COF) material (COF-1) has been synthesized by aldimine condensation reaction using the 1,3,5-triazine structure compound and isophthalaldehyde as starting materials. The nitrogen-rich COF-1 possesses medium specific surface area (321.78 m 2 /g), a pore diameter of 1.98 nm and relatively regular layered stack structure, which provide good conditions for iodine adsorption ability. The maximum iodine uptake of COF-1 is 2647 mg/g, which is higher than most iodine adsorbents reported. Subsequently, the release of iodine can be achieved in methanol indicating the iodine adsorption of COF-1 is a reversible process. It is also shown that COF-1 can be recycled. These characteristics maybe make COF-1 materials as a good iodine capturer in practical applications.Nuclear energy is a very important source of energy and its use will inevitably produce waste materials containing radioactive materials, of which the radionuclides 129 I and 131 I are the main components. Their half-lives are 15.7 million years and 8 days respectively. They can diffuse into the air quickly and exist for an extremely long time. 1 Radioactive iodine can also enter the human body through water, food, etc, and cause serious harm to environment and human health. 2,3 Thus, the research on iodine adsorption has attracted broad interests. The earliest iodine adsorbents were mainly inorganic adsorption materials, activated carbon, 4 zeolite 5 etc. Recent studies have shown that the large pore size and strong affinity for iodine are important factors of affecting the iodine adsorption performance. 6 Therefore, porous materials such as metal-organic framework (MOF), 7 conjugated microporous polymers 8 have also been used for

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Radioactive iodine volatilization inhibition effect of cyclodextrin

Cited by 8 publications

References 6 publications

Cluster‐Based Crystalline Materials for Iodine Capture

Cluster‐Based Crystalline Materials for Iodine Capture

Adsorption of Iodine from Aqueous Solution on Modified Silica Gel with Cyclodextrin Derivatives

Synthesis of One Covalent Organic Framework (COF) Based on C=N Bonds and Its Excellent Performance of Iodine Adsorption

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